PR c++/9257:

	* gdb.texinfo (Print Settings): Add an extra note about the need
	for a vtable.

diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index 05cf4fadc183ed4e9e6c826da77217f8e17e1eb0..b962215a9e4b5e68e97f2893168480eee667189a 100644 (file)
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,3 +1,9 @@
+2011-11-10  Tom Tromey  <tromey@redhat.com>
+
+       PR c++/9257:
+       * gdb.texinfo (Print Settings): Add an extra note about the need
+       for a vtable.
+
 2011-11-08  Maciej W. Rozycki  <macro@codesourcery.com>
 
        * gdb.texinfo (MIPS): Remove duplicate "auto" reference from

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index d2bdefa3e1f1df690d1eaa2e05b3aea3555e19f6..e898b4e4ee980b57cdc9404ba32145c3717518d8 100644 (file)
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -8372,7 +8372,10 @@ Display the encoding style currently in use for decoding C@t{++} symbols.
 @cindex display derived types
 When displaying a pointer to an object, identify the @emph{actual}
 (derived) type of the object rather than the @emph{declared} type, using
-the virtual function table.
+the virtual function table.  Note that the virtual function table is
+required---this feature can only work for objects that have run-time
+type identification; a single virtual method in the object's declared
+type is sufficient.
 
 @item set print object off
 Display only the declared type of objects, without reference to the